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Step 10Victory!!
I looked at the traces going to the volume control and they went through lots of capacitors and resistors and was very confusing.
I decided, what the heck, I'll just move the wires to the output side of the preamp, the LA3220 (pins 2 and 13), just for fun. Who knows, it just might help and if it blows something, too bad; I'm gettin' tired of fighting it.
Turns out, that was the trick! Now I have good volume control, no distortion; its great!
Hurray!! Thanks again unknownuser2007!
I can now plug the MP3 player, or any other device with a headphones output, into the MP3 Boombox and play it for all to hear. Yay!!
Now on to my next project where I will try to make a power supply to do away with the need for batteries for the MP3 player. Remember the power wires that originally went to the tape player motor? I'll try to do another Instructable for making a power supply to reduce that 7 volt motor power down to 1.5 volts for the MP3 player.
I hope this instructable might help anyone wanting to do something like this. I wanted to include my troubles I ran into along the way. Good luck!
In His name, HappyDad
I decided, what the heck, I'll just move the wires to the output side of the preamp, the LA3220 (pins 2 and 13), just for fun. Who knows, it just might help and if it blows something, too bad; I'm gettin' tired of fighting it.
Turns out, that was the trick! Now I have good volume control, no distortion; its great!
Hurray!! Thanks again unknownuser2007!
I can now plug the MP3 player, or any other device with a headphones output, into the MP3 Boombox and play it for all to hear. Yay!!
Now on to my next project where I will try to make a power supply to do away with the need for batteries for the MP3 player. Remember the power wires that originally went to the tape player motor? I'll try to do another Instructable for making a power supply to reduce that 7 volt motor power down to 1.5 volts for the MP3 player.
I hope this instructable might help anyone wanting to do something like this. I wanted to include my troubles I ran into along the way. Good luck!
In His name, HappyDad
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Would it be possible to wire in a USB port and trim down the 7 volts to 5 with a few diodes? I have used those MP3 players before, and they have a built-in USB port on them. Sounds like it could work in theory, I just don't know (because I cannot try myself) if the player would go into MASS Storage Mode. If it doesn't, then you could run the player from the USB power.
Good luck.
I looked at the traces going to the volume control and they went through lots of capacitors and resistors and was very confusing.
I decided, what the heck, I'll just move the wires to the output side of the preamp, the LA3220 (pins 2 and 13), just for fun. Who knows, it just might help and if it blows something, too bad; I'm gettin' tired of fighting it.
CAN you provide a pic for us tech impaired?.....can you email one
please !
bezzymares@yahoo.com